Heat capacity and phase behaviour of {1-propoxypropan-2-ol–water} system: Two-point scaling analysis

Abstract

The miscibility in the {1-propoxypropan-2-ol–water} system was investigated by differential scanning calorimetry. The specific heat capacities of 1-propoxypropan-2-ol aqueous solutions have been determined within the temperature range 274.15–338.15K, over the wide concentration range by DSC. The apparent and partial molar heat capacities were calculated. Observed maxima on the concentration dependences of the partial molar heat capacities were interpreted as the result of aggregation taking place in the solution. Two-point scaling theory was used to analyze obtained results. Influence of the temperature on the values of critical indices were discussed in terms of possible structural changes in the solution. The mixing scheme was determined on the basis of the scanning calorimetry experiment.